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3x-70=250-x
We move all terms to the left:
3x-70-(250-x)=0
We add all the numbers together, and all the variables
3x-(-1x+250)-70=0
We get rid of parentheses
3x+1x-250-70=0
We add all the numbers together, and all the variables
4x-320=0
We move all terms containing x to the left, all other terms to the right
4x=320
x=320/4
x=80
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